I had read a few posts about couplers and someone had recommended the Pet Walker Plus leash instead of using a coupler. I just received mine today and have to say it's great!!! I took the boys for a walk and there was no tangling or problems. Much easier than dealing with 2 separate leashes.
I would highly recommend it! I ordered mine from this company (fast shipping):
http://www.jbpet.com/index.php?main_...ihposlkioq48t3